\begin{table}

\caption{Registration and Voting by Treatment Arm\label{maincoefftable}}
\centering
\begin{tabular}[t]{lccc}
\toprule
  & Baseline Registration & (Re)Registration & Nov 2021 Turnout\\
\midrule
Information-Only Mail (T1) & \num{0.0004} & \num{0.0034} & \num{0.0026}\\
 & (\num{0.0019}) & (\num{0.0025}) & (\num{0.0035})\\
Research-Informed Mail (T2) & \num{0.0047}* & \num{0.0087}* & \num{0.0057}\\
 & (\num{0.0020}) & (\num{0.0027}) & (\num{0.0035})\\
\midrule
Difference: T2-T1 & 0.0042* & 0.0053 & 0.0031\\
 & (0.0021) & (0.0028) & (0.0037)\\
Num.Obs. & \num{23768} & \num{23768} & \num{23768}\\
Control Mean & 0.3424 & 0.0249 & 0.0554\\
\bottomrule
\multicolumn{4}{l}{\rule{0pt}{1em}All models include pre-treatment registration status as a covariate}\\
\multicolumn{4}{l}{\rule{0pt}{1em}* p $<$ 0.05}\\
\end{tabular}
\end{table}
